National Archives and Records Administration - ARC Identifier 89093 / Local Identifier BTL-BTL-192 - A CONTINENT IS BRIDGED (Reel 4 of 4) - Bell Telephone Laboratories, Inc. On telephone developments, 1876-1940. Reel 1 shows items in the American Telephone Historical Library and the Historical Museum in New York City and explains their historical significance. Dramatizes John Carty's belief, in 1880, that lines from Baltimore to Chicago will some day exist. Reel 2 dramatizes the signing of the certificate of incorporation of the A.T.T. in 1884 and the stage of improvement in 1892. Diagrams the principle of transposition. Reel 3 explains the use of loading and repeating coils and dramatizes conditions in 1911. Reel 4 reenacts the raising of the last pole for the first trans- continental line at Wendover, Utah, in 1915. Shows scenes of telephone employees at work and encourages historical research. DVD copied by IASL Master Scanner Timothy Vollmer.